Hidden units. What do you say about this?

[10-3 SquadLeader]

I have not read the guide thoroughly. I have a lot of experience in PzCampaigns but not in PzBattles.
One of my units tried to enter a hex but this was not possible because there were not enough movement points to assault; probably there was a hidden enemy unit there but this attempt is not enough to reveal the hidden unit so my unit cannot fire at this unit.